LG ARNU763B8Z4 INSTALLATION MANUAL
INSTALLATION MANUAL
AIR
CONDITIONER
ENGLISH FRANÇAIS ESPAÑOL
Please read this installation manual completely before installing the product.
Installation work must be performed in accordance with the national wiring
standards by authorized personnel only.
Please retain this installation manual for future reference after reading it
thoroughly.
Multi V Fresh Air Intake Unit
Original instruction
MFL69440014
Rev.02_072120
Copyright © 2016 - 2020 LG Electronics Inc. All Rights Reserved.
www.lghvac.com
IMPORTANT!
Please read this instruction sheet completely before installing the product.
This air conditioning system meets strict safety and operating standards. As the installer or service
person, it is an important part of your job to install or service the system so it operates safely and efficiently.
!
WARNING
• The information contained in the manual is intended for use by a qualified service technician familiar with safety procedures and equipped with the proper tools and test instruments.
• Failure to carefully read and follow all instructions in this manual can result in equipment malfunction, property damage, personal injury and/or death.
Caution: Improper installation, adjustment, alteration, service or maintenance can void the warranty.The
Safety Precautions
Note to installing dealer: The Owners Instructions and Warranty are to be given to the owner or promi-
nently displayed near the indoor Furnace/Air Handler Unit.
weight of the condensing unit requires caution and proper handling procedures when lifting or
moving to avoid personal injury. Use care to avoid contact with sharp or pointed edges.
• Always wear safety eye wear and work gloves when installing equipment.
• Never assume electrical power is disconnected. Check with meter and equipment.
• Keep hands out of fan areas when power is connected to equipment.
• R-410A causes frostbite burns.
• R-410A is toxic when burned.
!
WARNING
When wiring:
Electrical shock can cause severe personal injury or death. Only a qualified, experienced electrician
should attempt to wire this system.
• Do not supply power to the unit until all wiring and tubing are completed or reconnected and checked.
• Highly dangerous electrical voltages are used in this system. Carefully refer to the wiring diagram and these
instructions when wiring. Improper connections and inadequate grounding can cause accidental injury or death.
• Ground the unit following local electrical codes.
• Connect all wiring tightly. Loose wiring may cause overheating at connection points and a possible fire hazard.
When transporting:
Be careful when picking up and moving the indoor and outdoor units. Get a partner to help, and bend your knees
when lifting to reduce strain on your back. Sharp edges or thin aluminum fins on the air conditioner can cut your
finger.
When installing...
... in a wall: Make sure the wall is strong enough to hold the unit's weight. It may be necessary to construct a
... in a room: Properly insulate any tubing run inside a room to prevent "sweating" that can cause dripping and
... in moist or uneven locations : Use a raised concrete pad or concrete blocks provide a solid, level foundation
... in an area with high winds: Securely anchor the outdoor unit down with bolts and a metal frame. Provide a
... in a snowy area(for Heat Pump Model): Install the outdoor unit on a raised platform that is higher than drifting
When connecting refrigerant tubing:
• Keep all tubing runs as short as possible.
• Use the flare method for connecting tubing.
• Check carefully for leaks before starting the test run.
When servicing:
• Turn the power OFF at the main power box(mains) before opening the unit to check or repair electrical parts and
wiring.
• Keep your fingers and clothing away from any moving parts.
• Clean up the site after you finish, remembering to check that no metal scraps or bits of wiring have been left
inside the unit being serviced.
strong wood or metal frame to provide added support.
water damage to wall and floors.
for the outdoor unit. This prevents water damage and abnormal vibration.
suitable air baffle.
snow. Provide snow vents.
2 Indoor Unit
TABLE OF CONTENTS
4 FEATURES
5 SAFETY INSTRUCTIONS
8 INSTALLATION
8 Installation Limit
11 Selection of the best location
12 Ceiling dimension and hanging bolt location
13 Indoor Unit Installation
13 Wiring Connection
16 Flaring work
16 Checking the Drainage
17 Indoor Unit Drain Piping
19 DIP Switch Setting
20 Group Control Setting
24 Airborne Noise Emission
24 Limiting concentration
25 CAPACITY TABLES
Table Of Contents
ENGLISH
28
EXTERNAL STATIC PRESSURE AND AIR FLOW CHARTS
Installation Manual 3
Feature
Features
Installation Tool
Name Drain hose
Quantity
Shape
1 EA 2 EA 8 EA 4 EA 1 SET 1 EA
Air outlet vents
Air intake vents
Clamp metal
Washer for
hanging bracket
Air filters
Clamp
(Tie Wrap)
Wired Remote Controller
Insulation for
fitting
for gas pipe
for liquid pipe
Conduit
mounting plate
4 Indoor Unit
Safety Instructions
ENGLISH
Safety Instructions
The following safety guidelines are intended to prevent unforeseen risks or damage from
unsafe or incorrect operation of the appliance.
The guidelines are separated into ‘WARNING’ and ‘CAUTION’ as described below.
This symbol is displayed to indicate matters and operations that can cause risk.
!
Read the part with this symbol carefully and follow the instructions in order to avoid risk.
!
WARNING
This indicates that the failure to follow the instructions can cause serious injury or death.
!
CAUTION
This indicates that the failure to follow the instructions can cause the minor injury or damage to the product.
!
WARNING
Installation
• Do not use a defective or underrated circuit breaker. Use this appliance on a dedicated circuit.
- There is risk of fire or electric shock.
• For electrical work, contact the dealer, seller, a qualified electrician, or an Authorized Service Center.
- Do not disassemble or repair the product. There is risk of fire or electric shock.
• Always ground the product.
- There is risk of fire or electric shock.
• Install the panel and the cover of control box securely.
- There is risk of fire or electric shock.
• Always install a dedicated circuit and breaker.
- Improper wiring or installation may cause fire or electric shock.
• Use the correctly rated breaker or fuse.
- There is risk of fire or electric shock.
• Do not modify or extend the power cable.
- There is risk of fire or electric shock.
• Do not install, remove, or re-install the unit by yourself (customer).
- There is risk of fire, electric shock, explosion, or injury.
• Be cautious when unpacking and installing the product.
- Sharp edges could cause injury. Be especially careful of the case edges and the fins on the condenser and
evaporator.
• For installation, always contact the dealer or an Authorized Service Center.
- There is risk of fire, electric shock, explosion, or injury.
• Do not install the product on a defective installation stand.
- It may cause injury, accident, or damage to the product.
• Be sure the installation area does not deteriorate with age.
- If the base collapses, the air conditioner could fall with it, causing property damage, product failure, and
personal injury.
• Do not turn on the breaker or power under condition that front panel, cabinet, top cover, control box cover
are removed or opened.
- Otherwise, it may cause fire, electric shock, explosion or death.
Installation Manual 5
Safety Instructions
• Use a vacuum pump or Inert (nitrogen) gas when doing leakage test or air purge. Do not compress air or
Oxygen and Do not use Flammable gases. Otherwise, it may cause fire or explosion.
- There is the risk of death, injury, fire or explosion.
Operation
• Do not let the air conditioner run for a long time when the humidity is very high and a door or a window is left
open.
- Moisture may condense and wet or damage furniture.
• Take care to ensure that power cable could not be pulled out or damaged during operation.
- There is risk of fire or electric shock.
• Do not place anything on the power cable.
- There is risk of fire or electric shock.
• Do not plug or unplug the power supply plug during operation.
- There is risk of fire or electric shock.
• Do not touch(operate) the product with wet hands.
- There is risk of fire or electrical shock.
• Do not place a heater or other appliances near the power cable.
- There is risk of fire and electric shock.
• Do not allow water to run into electric parts.
- There is risk of fire, failure of the product, or electric shock.
• Do not store or use flammable gas or combustibles near the product.
- There is risk of fire or failure of product.
• Do not use the product in a tightly closed space for a long time.
- Oxygen deficiency could occur.
• When flammable gas leaks, turn off the gas and open a window for ventilation before turn the product on.
- Do not use the telephone or turn switches on or off. There is risk of explosion or fire.
• If strange sounds, smell or smoke comes from product. Turn the breaker off or disconnect the power supply
cable.
- There is risk of electric shock or fire.
• Stop operation and close the window in storm or hurricane.
If possible, remove the product from the window before the hurricane arrives.
- There is risk of property damage, failure of product, or electric shock.
• Do not open the inlet grill of the product during operation.
(Do not touch the electrostatic filter, if the unit is so equipped.)
- There is risk of physical injury, electric shock, or product failure.
• When the product is soaked (flooded or submerged), contact an Authorized Service Center.
- There is risk of fire or electric shock.
• Be cautious that water could not enter the product.
- There is risk of fire, electric shock, or product damage.
• Ventilate the product from time to time when operating it together with a stove, etc.
- There is risk of fire or electric shock.
• Turn the main power off when cleaning or maintaining the product.
- There is risk of electric shock.
• When the product is not be used for a long time, disconnect the power supply plug or turn off the breaker.
- There is risk of product damage or failure, or unintended operation.
• Take care to ensure that nobody could step on or fall onto the outdoor unit.
- This could result in personal injury and product damage.
6 Indoor Unit
Safety Instructions
CAUTION
ENGLISH
Installation
• Always check for gas (refrigerant) leakage after installation or repair of product.
- Low refrigerant levels may cause failure of product.
• Install the drain hose to ensure that water is drained away properly.
- A bad connection may cause water leakage.
• Keep level even when installing the product.
- To avoid vibration or water leakage.
• Do not install the product where the noise or hot air from the outdoor unit could damage the neighborhoods.
- It may cause a problem for your neighbors.
• Use two or more people to lift and transport the product.
- Avoid personal injury.
• Do not install the product where it will be exposed to sea wind (salt spray) directly.
- It may cause corrosion on the product. Corrosion, particularly on the condenser and evaporator fins, could
cause product malfunction or inefficient operation.
• If you eat the liquid from the batteries, brush your teeth and see doctor. Do not use the remote if the
batteries have leaked.
- The chemicals in batteries could cause burns or other health hazards.
Operation
• Do not expose the skin directly to cool air for long periods of time. (Don't sit in the draft.)
- This could harm to your health.
• Do not use the product for special purposes, such as preserving foods, works of art, etc. It is a consumer air
conditioner, not a precision refrigeration system.
- There is risk of damage or loss of property.
• Do not block the inlet or outlet of air flow.
- It may cause product failure.
• Use a soft cloth to clean. Do not use harsh detergents, solvents, etc.
- There is risk of fire, electric shock, or damage to the plastic parts of the product.
• Do not touch the metal parts of the product when removing the air filter. They are very sharp!
- There is risk of personal injury.
• Do not step on or put anything on the product. (outdoor units)
- There is risk of personal injury and failure of product.
• Always insert the filter securely. Clean the filter every two weeks or more often if necessary.
- A dirty filter reduces the efficiency of the air conditioner and could cause product malfunction or damage.
• Do not insert hands or other objects through the air inlet or outlet while the product is operated.
- There are sharp and moving parts that could cause personal injury.
• Do not drink the water drained from the product.
- It is not sanitary and could cause serious health issues.
• Use a firm stool or ladder when cleaning or maintaining the product.
- Be careful and avoid personal injury.
• Replace the all batteries in the remote control with new ones of the same type. Do not mix old and new
batteries or different types of batteries.
- There is risk of fire or explosion.
• Do not recharge or disassemble the batteries. Do not dispose of batteries in a fire.
- They may burn or explode.
• If the liquid from the batteries gets onto your skin or clothes, wash it well with clean water. Do not use the
remote if the batteries have leaked.
- The chemicals in batteries could cause burns or other health hazards.
• If you eat the liquid from the batteries, brush your teeth and see doctor. Do not use the remote if the
batteries have leaked.
- The chemicals in batteries could cause burns or other health hazards.
Installation Manual 7
Installation
Installation
Installation Limit
Read completely, then follow step by step.
1. Fresh Air Intake Unit Combination
No Connection Condition Combination
Only Fresh Air Intake Unit
1
installation
1) The total capacity of Fresh Air Intake Unit should be 50~100% of outdoor unit.
2) The max quantity of Fresh Air Intake Unit is 4 Units.
Mixture Installation with
2
standard indoor units and
Fresh Air Intake Units
!
CAUTION
1) The total capacity of indoor units (standard Indoor Unit + Fresh Air Intake
Unit) should be 50~100% of outdoor unit.
2) The total capacity of Fresh Air Intake Unit should be less than 30% of the
total outdoor unit capacity.
Failure to comply with the above connection conditions for installation, it can cause
cooling & heating capacity down.
2. Connection of the Outdoor Unit
<Only Fresh Air Intake Unit install>
Outdoor : 10HP
FAU
5HP 5HP
<Wrong Install>
Outdoor : 20HP
FAU
FAU
Standard Standard Standard Standard
5HP 5HP 5HP 5HP 5HP
<Mixture Install>
Outdoor : 20HP
FAU
5HP
Standard Standard Standard
5HP 5HP 5HP
* FAU : Fresh Air Intake Unit
Standard: Standard Indoor Unit
▶ The total capacity of indoor units exceed 100% of outdoor unit.
8 Indoor Unit
3. Installation of intake air duct
Min. 78.7 inch
1/30 Slope
Outlet Air
Exhaust air
Inlet Hood
Intake Air Duct
Fresh Air Intake Unit
Exhaust Fan
Door
① Inlet Hood
Inlet Hood should be installed such that no water enter inside the unit
② Intake Air Duct
The Intake Air Duct must have down-slope about 1/30.
The length of Intake Air Duct should be longer than 78.7 inch.
Installation
ENGLISH
③ Fresh Air Intake Unit
If wired remote controller is not connected, it will display strange value to the room temperature
④ Exhaust Fan
Fresh Air Intake Unit will make room the positive pressure.
Exhaust fan should be installed to maintain the room pressure.
⑤ Door
It would be possible to raise in the room air pressure because of Fresh Air Intake Unit.
In that case, the door could hurt someone in front of door.
So be careful of the positive pressure to design the door.
Installation Manual 9
Installation
FAU
48 kBtu/h
ZONE 1
FAU
48 kBtu/h 48 kBtu/h 48 kBtu/h
Standard Standard
ZONE 2
FAU
48 kBtu/h
ZONE 1
FAU
48 kBtu/h 48 kBtu/h 48 kBtu/h
Standard Standard
ZONE 2
FAU
Set one of the Standard Indoor Unit to Master
StandardStandard Standard
Slave
* FAU: Fresh Air Intake Unit
Standard: Standard Indoor Unit
4. The Control System
1)
In case of connecting with Standard indoor units, Standard indoor unit should be a master unit.
Separate Fresh Air Intake Unit with Standard indoor units
Set only one of Standard indoor units to Master,
2) In case of using central remote controller, mixture of indoor units and Fresh Air Intake Unit in
same zone is not possible.
Separate Fresh Air Intake Unit zone with Standard indoor units zone.
5. Cycle check and SVC
For Fresh Air Intake Unit cycle check and SVC, LG MV 5.8 or later version should be used.
10 Indoor Unit
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